$$6 \mathrm{CO}_2 + 6 \mathrm{H}_2\mathrm{O} + \text{Energy} \rightarrow 6 \mathrm{O}_2 + \mathrm{C}_6\mathrm{H}_{12}\mathrm{O}_6$$

Question 1

Which of the following best describes the main purpose of photosynthesis in plants?

Accepted Answer

To convert solar energy into chemical energy stored in glucose

Question 2

Which equation correctly represents the overall process of photosynthesis?

Accepted Answer

$$6 \mathrm{CO}_2 + 6 \mathrm{H}_2\mathrm{O} + 	ext{Energy} ightarrow 6 \mathrm{O}_2 + \mathrm{C}_6\mathrm{H}_{12}\mathrm{O}_6$$

Question 3

Which of the following is NOT a product of the light reactions of photosynthesis?

Accepted Answer

Glucose ($$\mathrm{C}_6\mathrm{H}_{12}\mathrm{O}_6)$$

Question 4

What is the primary role of NADP+ in the light reactions of photosynthesis?

Accepted Answer

To accept electrons and become reduced to NADPH

Question 5

Where in the chloroplast do the light reactions take place?

Accepted Answer

Thylakoid membrane

Question 6

Which of the following best explains why the Calvin cycle is sometimes called the 'dark reaction'?

Accepted Answer

It does not require light directly, but depends on products of the light reactions

Question 7

During the light reactions, what is the immediate source of electrons for the electron transport chain?

Accepted Answer

Water ($$\mathrm{H}_2\mathrm{O})$$

Question 8

Which of the following statements about autotrophs is correct?

Accepted Answer

They produce organic molecules from $$\mathrm{CO}_2$$ and other inorganic materials

Question 9

What is the main function of ATP in the cell?

Accepted Answer

To provide energy for cellular work by releasing a phosphate group

Question 10

Which of the following best describes the flow of energy in an ecosystem as shown in the diagram?

Accepted Answer

Energy flows from light to chemical energy in organic molecules, then to ATP, and is finally lost as heat

Question 11

Which step in the Calvin cycle is responsible for incorporating carbon from $$\mathrm{CO}_2$$ into organic molecules?

Accepted Answer

Carbon fixation

Question 12

A plant is exposed to a toxin that inhibits the enzyme NADP+ reductase. Which process would be directly affected?

Accepted Answer

The reduction of NADP+ to NADPH

Question 13

Which of the following is a correct description of the relationship between the light reactions and the Calvin cycle?

Accepted Answer

The light reactions provide ATP and NADPH to power the Calvin cycle

Question 14

Which of the following is a by-product of the splitting of water during the light reactions?

Accepted Answer

Oxygen ($$\mathrm{O}_2)$$

Question 15

If a plant's thylakoid membranes were damaged, which process would be most directly affected?

Accepted Answer

The light reactions

Question 16

Which molecule acts as the final electron acceptor in the light reactions of photosynthesis?

Accepted Answer

NADP+

Question 17

Why must the Calvin cycle turn twice to produce one molecule of glucose?

Accepted Answer

Each turn produces one 3-carbon sugar, and two are needed to make glucose

Question 18

Which of the following is NOT required for the light reactions to occur?

Accepted Answer

Glucose

Question 19

A mutation prevents a plant from producing chlorophyll b. Which process would be most directly affected?

Accepted Answer

Absorption of light energy in the light-harvesting complex

Question 20

Which of the following best explains why oxygen is released during photosynthesis?

Accepted Answer

Oxygen is produced when water is split to provide electrons for photosystem II

Photosynthesis: Mechanisms and Importance in Biology

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